Like Windows 10, this release completely replaces the Start screen with the Start Menu.
There are six main areas visible when the Start menu first appears.
Header. This is where the user account picture and power button appear. Pinned List. Apps that are pinned for easy access appear here. Most Frequently Used applications list (MFU). Apps that are frequently used but not pinned anywhere else will appear here. All Apps button. Selecting this button displays the All Apps list. Search text box. Typing here begins a search. App grid. Both Immersive and Win32 apps can be pinned, unpinned, and resized in this area.
Start menu on Windows RT 8.1 pic.twitter.com/k2dOfYd2fh
— Tero Alhonen (@teroalhonen) September 15, 2015